The CAS Registry Mumber 137186-20-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,1,8 and 6 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 137186-20: (8*1)+(7*3)+(6*7)+(5*1)+(4*8)+(3*6)+(2*2)+(1*0)=130 130 % 10 = 0 So 137186-20-0 is a valid CAS Registry Number.
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